LP 543-25: A Rare Low-mass Runaway Disk Star
Abstract
LP 543-25 or PSS 544-7 is a high proper-motion star located 458 pc from the Sun in the constellation of Canis Minor; it has been argued that it could be a candidate cannonball star ejected by a star cluster. Here, we revisit the issue of the kinematics of this interesting star using Gaia DR2. The heliocentric Galactic velocity components are (U, V, W) = (206, -289, 30) km/s; the corresponding Galactocentric Galactic velocity components show that LP 543-25 is moving in the Galactic plane and away from the Galactic Center at a rate of nearly 200 km/s, which is compatible with an origin in one of the multiple star clusters that inhabit the inner regions of the Milky Way. LP 543-25 appears to be a member of an elusive class of stars, the low-mass runaway stars. It is perhaps one of the closest and less massive runaway stars identified so far.
- Publication:
-
Research Notes of the American Astronomical Society
- Pub Date:
- May 2018
- DOI:
- 10.3847/2515-5172/aac5d7
- arXiv:
- arXiv:1805.06423
- Bibcode:
- 2018RNAAS...2...35D
- Keywords:
-
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 3 pages, 1 figure. Accepted for publication in Research Notes of the AAS